Predetermined stop mechanism



Jam 1-941- c. P. GRIFFITH ETA}. 2,228,820

BREDETERMINED STOP IECHMIISI Fil'ed Oct. 21, 1937 4 Sheets-Sheet 1 QYWzMMW ATTORNEY.

an.14,1941. QRGRIFFiTH m 2 228,820

PREDETERMINED STOP MECHANISM Filed Oct. 21, 1937 4 Sheets-Sheet 2 ATTORNEY.

1941- c. P. GRIFFITH-EA PREDETERMINED STOP MECHANISM 4 Sheets-Sheet 3 Filed 001:. 21, 193'] ATTORNEY.

Jan. 14, 1941. c. P. GRIFFITH z-rm.

PREDETERMINED STOP MECHANISM 4 Sheeis-Sheet 4 Filed Oct. 21, 1937 IN VENTORS.

ATTORNEY.

Patented Jan. 14, 1941 PREDETERMINED STOP MECHANISM Clement r. Grimth and Lee a. Hartley, Fort Wayne, Ind., assignors to S. F. Bowser & Company, Incorporated, Fort Wayne, 11111., a corpe= ration of Indiana Application October 21, 1937, Serial No. 170,259

10Claims.

Various predetermined stop mechanisms have been proposed in which a control bar is biased to move to operation stopping position but is latched 19' means, the latter means are unable to operate at the appointed time with the result that the cycle oi operation of the predetermined stop mechanism is not terminated as desired. The stop mechanism in which the present in- 15 vention is embodied is disclosed as being applied to a liquid control system and in such a system an overdelivery of liquid would result if the stop mechanism did not function at the appointed time with a possible attendant result that the re- 20 ceptacle to be filled would be overflowed and a time hazard would be created.

Applicants provide positively operating power means to eliminate the difliculties outlined above.

It has been customary for members oi the liquid handling industry to provide a singlemodel of combined quantity predetermining and indicating mechanism which could be applied to any one of a number of meters. The choice of the customer was thus limited to a particular volume 30 indicating mechanism when quite often he would have preferred to use a difierent type of indicating instrument in connection with the predetermining mechanism. Applicantshave increased the range of equipment open for selection by the customer by forming the predetermin-ing mechanism as an independent mechanism upon which any one of a number of counters may be mounted.

' One of the "objects of this invention is to provide means for positively disabling the latching means for the control bar in a predetermining mechanism.

It is a further object of the invention to provide in connection with the control mechanism of the cam type, a follower which cannot become overloaded to the extent that it will not operate.

It is still another object of the invention to provide a positively operating unlatehing mechanism for a device of the type disclosed.

Yet another object of the invention is to provide power means for unlatching the latching elements of the predetermining mechanism.

Btfll another obje'ct of the invention is to provide positively operated means for unlatching the latching elements in each stage of a two stag type of mechanism.

A further object of the invention is to provide the positively operating unlatching mechanism for a device of the type disclosed. 5

Yet another object of the invention is to provide set'table means which are adjustable by a single operator to control the length of cycle of the predeter-mini-ng means. r

A further object of the invention is to provide a latch tripping mechanism which comprises a rotating notched cam and a follower which is adapted to engage the notch of .the cam to diii'erent depths so that the point of disengagement of the two elements will vary, resulting in a diii'erent amplitude of operation of the follower.

Still another object of the invention is to provide a latch tripping mechanism comprising a rotating notched cam and a follower adapted to engage the notch so as to be operated by the cam, and control means for permitting the follower to engage the notch of .the cam to different depths depending upon the amplitude of motion desired in the follower.

It is another object of the invention to provide an emergency release mechanism for releasing said latching means prior to the operation of said predetermin ing mechanism.

Yet another object 01' the invention is to provide a predetermining mechanism housing which serves as an adapter between any of a series of meters and any of a plurality oi. registers.

Still another object of the invention is to provide a predetermining mechanism which transmits motions from a meter to a register.

Yet another object of the invention is to provide, in a predetermining mechanism adapted for use with resettable registers, means for preventing the removal oi. backlash from the gears of the predetermining mechanism during the resetting operation.

Still another object of the invention is to provide an efiicient device for holding a frangible transparent dial or piece of glass in place over an opening in a housing. Another object is to provide a resilient element which is sprung into place behind a frangible piece of glass .to hold it in sea!- ing engagement with the edgesof a sight opening.

Other objects will become apparent from a study of the following specification taken in connection with accompanying drawings in which:

Figure 1 is an elevation of the predetermining device mounted on a meter and connected to control' a flow control valve and to operate a printing register. 56

Figure 2 is a plan view of the predetermining mechanism with parts of the housing broken away to show the interior parts.

Figure 3 is a sectional view taken on the line 3-4 of Figure 2 showing the release mechanism in elevation.

Figure 4 is a sectional view taken on the line 4-4 of Figure 2 showing the emergency release mechanism.

Figure 5 is a perspective view showing the relation of the control bar, the control and actuator mechanism in the single stage device.

Figure 6 is a perspective view similar to Figure 5 except that it discloses a two stage mechanism.

Figure 7 is a sectional view taken on the line 1-1 of Figure 2 showing the stop mechanism and the adjusting means therefor.

Figure 8 is an exploded view showing a cam and indicator wheel assembly.

Figure 9 is a perspective view with parts broken away showing the means provided for holding a glass in sealing position over a sight opening in the housing.

Single stage mechanism Referring to Figure 1 of the drawings, the numeral N indicates a liquid meter to which is connected by. means of the nipple It, a valve I! which comprises a valve stem i1 provided with a collar I9 attached to be engaged by the yoke portion of an operating lever 2! so that depression of the lever will raise the valve stem and open the valve.

Links 23 and 25 are pivoted to a block 21 by means of the pin 29 while the opposite ends of the links are respectively connected to the valve stem and to a lug on the valve body by means of the pins 3| and 33.

The predeterminer body indicated generally by the numeral 35 is mounted by means of cap screws 31 upon the meter H. A control bar 39 is mounted within the body and is provided at the end adjacent the valve I! with a lug II which is internally threaded to receive a screw ll upon which is mounted the block 21. Jam nuts are mounted on said screw 43 on either side of block 21 to permit adjustment of said block thereon to adjust for inaccuracies in manufacture and assembly of the cooperating parts, and a Jam nut cooperates with lug 4| topermit dislocation of screw 43.

A register indicated generally by the numeral 45 is mounted on a predeterminer body by means of a. flange 41 upon which the register 45 is seated and held by cap screws 49. The register shown in Figure 1 is of the resettable indicating and ticket printing type. However, any desired type of register having a base adapted to fit the flange 41 of the predeterminer body may be mounted upon the predeterminer to .be driven by a shaft, later to be described, which forms a part of the predeterminer mechanism.

Shown also in Figure 1 is an adjustment knob 5| which is slldable longitudinally to successively engage the indicator dials 53 and to rotate them to indicate the setting of the predetermined stop mechanism.

A detent 55 is arranged to engage grooves 51 on the shaft 59 to insure that the shaft will be moved to and retained in adjusting relation with respect to a selected dial 53 during the process of setting the same.

A collar 6| pinned to the shaft 5! which engages a frame member to be described, limits a longitudinal motion thereof in one direction while a collar 63 which engages a similar frame member limits longitudinal motion of the shaft in the opposite direction.

A push button 85 shown in Figure 1 is the operator of a manually operated emergency release device later to be explained.

Referring to Figure 3 a slotted coupling 61 is adapted to receive a meter shaft 69 so that the rotation of the latter during operation may be transmitted through shaft 10 to the worm 'll. Thisshaft is extended beyond the worm II and carries a pin 13 which forms the driving portion of the connection between the predetermining mechanism and the mechanisms of register 45.

' A knurled friction wheel 15 is fixed to the shaft 10 and is adapted to cooperate with one or the other of teeth 11 on a double armed lever 10 which is pivoted at 8| on a fixed portion of the frame as of the predetermining mechanism. A spring 85 is connected at one end to a lever 19 and at its other end to a fixed portion 81 of the frame and urges one of the teeth 11 into engagement with the knurled wheel 15.

The element 15 cooperating with one or the other of the teeth I1, depending upon whether the bar 39 is assembled in the unit for right or left hand operation, is held against rotation in either direction until the load exceeds a predetermined magnitude. It is not desired to positively prevent rotation since this might result in damage to the mechanism in the event engagement of the parts is effected during the operation of the driving mechanism as might occur in the two stage mechanism to be described.

However, it is desired to hold the shaft against rotation in a reverse direction by torques below a predetermined magnitude since it has been found that the operation of resetting the indicators of mechanism 45 produces a limited torque on the shaft 10 tending to rotate the shaft reversely. Such rotation is possible due to lost motion in the connection 81 and in the parts of the driving mechanism and if the rotation is not prevented. the backlash or lost motion in gears 1|, '9, SI and 8! would be taken up in a reverse direction with the result that on the next operation of the apparatus the driving means, which we will assume is a meter, must rotate an amount sufficient to again take up the backlash and lost motion in the driving train leading to cam 89 before the latter will turn, and under such circumstances an amount of liquid greater than that recorded on the indicators 53 would be delivered. By maintaining the shaft 10 against backward rotation such over-delivery is prevented.

The worm II (Figures 3 and 5) drives the worm wheel I! which is mounted for rotation upon a stud OI carried by the frame 83 and has fixed to it a spur gear N which drives a spur gear 0!. The latter is connected to a shouldered bushing 81 upon which is mounted a power cam SI and 9. Geneva mutilated transfer gear Ill. The cam is provided with a notch "I, the purpose of which will be later described. and is further formed integrally with a part III of the gear I. The second portion I of the gear is attached to the ilrst portion by means of rivets turn meshed with a gear I01 (Figures 7 and 9) which is rotatably mounted on one end of a bushing I09 which is mounted for free rotation on shaft 59.

Indicator dial 59 is recessed at I09 to receive a ratchet IIO which carries an axial flange inwhich the ratchet teeth are formed.

The portion II2 of the gear I09 which is formed integrally with cam I09 is cut away'to receive a pawl I I4 which is rotated in a counterclockwise direction by a spring H9. The portion 9 of the gear I09 formed separately of the cam is adapted to overlie the pawl and spring just described to hold them in position. Rivets or other suitable fastenings are provided to hold the ratchet H and part H9 in position on the dial and cam to form a single unit of all of the parts just described and this unit is fixed upon the bushing I09 .with the pawl I I4 extending through a notch I20 in said bushing to engage the shaft 59.

A groove I22 is formed in shaft 59 and is 1 adapted to be positioned for engagement with a pawl N4 of one of the dial units upon movement of shaft 59 axially to stations determined by the detent 55 and grooves 51 or the collars 6| and 59 and their cooperating frame members 99.

The gear I01 is provided with pawls I24 pivoted thereon and urged toward the periphery thereof by springs I29. The pawls are adapted for engagement with the teeth of ratchet H0 and are arranged to transmit clockwise rotation (Figure 8) to the dial unit at the same time the pawls will permit clockwise rotation of the dial unit under action of shaft 59, groove I22 and pawl II4 relative to gear I01 to permit setting of thedials and cams to a selected position.

The dial units incorporating cams H9 and H are constructed in a manner similar to that of cam I09 just described. The ratio of the transfer gearing is ten to one so that the right hand indicator dial 59 will indicate units, the intermediate dial will indicate tens and the left hand dial will indicate hundreds. It is obvious that any ratio of gearing and any number of dials may be used, if desired, and applicant accordingly does not desire to be held solely to that disclosed.

A ball I I1 is mounted for rocking motion about a fixed shaft I I9 which is supported in the frame 99. The bail extends longitudinally of the shaft II9 into position adjacent cams I09, I|9and H5 and is provided when projections I2I, I29 and I2; which are adapted respectively to cooperate with notches formed in said cams.

The ball has fixed thereto at the end adjacent cam I09, a headed pin I21. A lever I29 is slotted at one end as shown at I9I to permit longitudinal motion thereof and is mounted with its slotted end upon a pivot screw I99 which is attached to a fixed portion of the frame 99. The lever is off-set as shown in Figure 5 and is provided wi h a projection I95 which lies in the plane of the cam 99 and is adapted under certain conditions to enter the notch IOI thereof. The lever is also provided with a recess I91 which is adapted to be received between the upright arm of bail H1 and the head'of the pin I21.

A springl99 (Figure 3) is hooked about shaft I I9 and engages an opening I .in said lever I29.

The spring serves to urge lever I29 as viewed in Figure 3 toward its extreme right hand position so that the recess I91 will occupy the groove between the headed pin I21 and bail H1 and so that the lever will tend to follow any clockwise motion of the ball I" and will thus be brought into yielding engagement with the cam 99, that is, the lever I29 will yield In the direction of its axis in the event the surface of the cam is slightly irregular.

A bent-over ear I49 (Figures 3 and 5) is formed on the lever and a stop I45 is inserted in a threaded opening in said ear and is retained in place by a jam nut I41. This stop is adjustable by loosening the nut I41 and rotating the screw with respect to the ear I49.

A stop plate I49 is fixed by means of cap screws I H to'a fixed portion of the frame 89 and is provided with an upturn stop flange I59. An opening I55 is formed in the bottom portion v of said plate to receive the shank I51 of bifurcated member I59. The shank fits freely in the opening I55 and is positioned above the stop I45 and is adapted to be raised thereby.

The control bar 99 is provided with a notch I9I which is adapted to receive stop fiange I59 when the valve I5 is in its open position. The control bar lies in the slot of the bifurcated member I59, is adapted to slide back and forth therein and carries a stud I99 projecting horizontally therefrom which is adapted to engage one of the arms 19 of the friction mechanism to retain tooth 11 out of engagement with the knurled wheel while the control bar is in its farthest right hand position as viewedin Figures 1, 2 and 5.

The emergency release mechanism shown in Figure 4 comprises a bell crank lever I65. One arm of the bell crank I91 projects underneath and transversely of the control bar 99 while the other arm I99 extends downwardly and is formed with a substantially vertical open ended slot I1I which is arranged to receive the pin I19 mounted on the stem I15 to which the emergency release push button 55 is attached. A spring I11 is attached at one end to a loop formed on said pin I19 and at the other end to a pin I19 which is fixed in the frame 99..

As viewed in Figure 4 the spring I11 tends to maintain a push button and its associated stem in the outermost or left hand position and maintains the arm I91 of the bell crank out of contact with the control bar 99. However, pressure exerted on said push button will result in arm I91 being rotated counter-clockwise about the pivot I9I until contact is established with control bar close the number of steps intervening between the position of notches in the predetermining cams and zero position of the notches, that is, the indicia on the indicators will disclose the setting of the predetermining cams. An opening I95 is formed in said housing 95 opposite said plate I99 and'a piece of glass I91 is held in position in front of said opening by means of a spring frame I 99 which is attached to be confined-at its ends in grooves I9I so that it will exert a. pressure against the piece of glass to hold it in place in the housing 95. A gasket I90 of cork or other suitable material is interposed between said seal to exclude moisture from, the housing.

piece of glass and the housing so as to form a Operation In operating the structure just described, the attendant will shift the knob 5i longitudinally to engage the dials 53 in succession and will rotate said knob to adjust said indicator dials 53, individually, to positions indicating the quantity desired to be delivered. Since the gears. I91 are held by the meter, the ratchet H9 and pawls I29 will become disengaged to permit rotation of the dials.

Since each indicator dial 53 is attached to a cam I99, H3 or II5, the cam will be-rotated away from its normal position in which the notch therein is in alignment with the projection on the ball I II, to a degree indicated by the numeral which appears in the sight opening in the plate I83.

In other words, if a dial indicates the numeral 5, a motion of the cam corresponding with the dial will be displaced substantially 180 degrees from the projection on the ball I I! which cooperates with the cam. The trailing wall of the notch is formed so that if the cam is rotated by means ure 3 in which lever I29 is rotated to its farthest clockwise position by means of spring I39 acting thereon and in which the bifurcated member I59 will rest upon the stop plate I53. This permits the control bar 39 to pivot in a counterclockwise direction about pin 29 so that it will rest under the action of gravity upon the flange I53.

The operator will, either before or after the sequence of operations just described, reset or perform such other operations as are necessary to condition the register 95 for an operation. He will thereupon depress the valve lever 2| to open the valve. Upon vertical displacement of the valve stem, the links 23 and 25 will approach axially aligned positions with the result that the control bar 39 will be displaced toward the valve I5 which is to the right in Figures 1, 2and 5 until the notch I5I engages the flange I53. As the control bar is moved, stud I53 engages arm I9 and swings it in a clockwise direction (Figure 2) against the action of spring 95 to release tooth 11 from the knurled wheel I5.

If pressure on the valve lever 2i is released, the control bar and associated valve parts will be held in the operated position by the notch and flange above referred to against the pressure exerted by the valve spring which tends to shut the valve and consequently tends to displace the control bar in a left hand direction. Opening of the valve will result in operation of the meter II and the shaft I9 together with worm II.

. Motion of the meter will also be transmitted to in the clockwise direction as indicated by the arrow in Figure 5 and the followers I2I, I23 and I25 on bail H1. The cams I99 and H3 being faster than the cam II5 control of the ball will rest upon the cam II5 until the notch in this cam becomes aligned with the follower I25 of the bail whereupon control of the ball will be transferred to the cam II3.

Similarly, since the cam I99 is faster than the cam II3, control of the bail will be transferred to cam I99 when the follower I23 comes into alignment with the notch in cam II3. When the notch in cam I99, thereafter, comes into alignment with the follower I, the bail II! will be free to rotate in the clockwise direction about shaft II9 under the action of spring I39 and lever I29.

Under the same condition of operation, the lever I29 will be urged by spring I39 into a position with its projection I35 in engagement with a cam 99 so that when notch III in this cam engages the projection I35, the lever will be caused to pivot in a counter-clockwise direction (Figures 3 and 5) about pin I33 and stop I95 will engage the shank I51 and lift the bifurcated member I59 from its position of rest on the stop plate. This motion of the bifurcated member causes a clockwise rotation of the control bar 39 about pin 29 (Figure 1) and effects the release of notch 'I9I from the stop flange I53 to permit a leftward motion of the stop bar 39 (Figure 1) under the action of the valve spring, not shown. Thus, it will be seen a power mechanism was provided which will disengage the retaining means of the stop mechanism when the predetermined quantity has been dispensed.

It is obvious that the notch I9I in cam 99 will occupy the same angular position at the end of each operation since the time interval between the engagement of projection I35 in the notch and the closing of the valve will be substantially the same each time. It follows that thenotch will occupy the same position at the end of a dispensing operation that it did at the start of that operation and thus only exact multiples of the quantity represented by a complete revolution of the cam will be dispensed. We will assume that this is one gallon although it may be any predetermined multiple or fraction thereof.

The final transfer of motion to cam I99 may occur at any point in the path of notch III after it has accomplished its penultimate passage of projection I35 and its ultimate passage of its final position. In practice the transfer mechanism is constructed and arranged to function shortly after said ultimate passage and consequently the notches in cams I99, H3 and III will be aligned and projection I35 will ride on the surface of cam 99 during the greater portion of its final revolution.

When the notch I9I reaches the projection I35 in this revolution, it will engage the same and actuate it to terminate the dispensing operation and when this is done the cam notch will occupy its original or starting position.

It is true that the indicators will read zero during the delivery of most of the final gallon but this does not affect the accuracy of the de- '1ivery. They will remain in the zero position until they are set again because no transfer occurs after projection I35 is actuated.

The indicators 53 will retrograde until at the time of release of the stop mechanism, they will indicate zeros in all positions. Should it be necessary to terminate the dispensing operation before this is accomplished by the stop mechanism just described, the operator may displace the push button 95 inwardly to cause a counterclockwise rotation of the bell crank I95 (Figure 4) which in turn will cause control bar 39 to. rotate in a clockwise direction (Figure l) and disengage notch I9I from the stop flange I53 to 'permit a leftward motion of the bar under action of the valve spring and to permit consequent closure of the valve and cessation of dispensing operation.

It will be noted that the lever 19 is formed symmetrically about the central axis through the pin 8| and is formed with two teeth 11. This is for the p p se of permitting the control bar 39 to be disposed in thepredeterminer housing with the connecting lug ll in either right or left hand positions so that the valve I5 may be mounted either to right or left of the predetermining mechanism without necessitating the rotation of the predetermining mechanism 180 degrees. When the lug 4| is disposed to the left of the predetermining mechanism as shown in Figure 2, the stud I53 will be disposed on the right hand side of lever 19 and the spring 35 will be connected to the left hand arm of lever 19 so that as the bar 39 moves to the left in opening the valve. the stud I53 will engage the right hand arm of the lever 19 to release the knurled wheel 15.

Two stage mechanism It is, at times, desirable to stop the flow of liquid to the dispensing system in a series of stages. This is especially valuable when dispensing lines reach diameters of three inches or more.

A modified form of stop mechanism is shown in Figure 6 which is adapted to accomplish this result. In this view, shaft I55 drives the worm I99, worm wheel I9I and the spur gears I93 and I95 and transmit rotation to cam I91. In this case, however, cam I91 bears an indicator dial I99 which is fixed to move with it. The internal construction of the cam and indicator dial assembly is the same as shown in Figure 8. Further, the control assembly will be the same as that shown in Figure 7 except that the first cam unit will be replaced by a unit such as that shown in Figure 8 and the collar 53 will be omitted to permit shaft 59 to move far enough to the right to engage groove I22 with pawl Ill of the lowest order dial. An extra groove 51 may be provided in shaft 59 to take the place of the collar 53.

A cam 20I having two notches, 203 and 205, occupies the tens position and has attached to it a number wheel. The angular spacing of the notches determines the number of transfers between the units order and the tens order which occur before the final operation of the control bar and hence controls the number of gallons delivered at the slow rate of flow.

To describe I construction in a difi'erent manner, it will be understood that one revolution of the units cam I91 will effect one transfer and bails and will position notch 203 in alignment therewith. If then one revolution of cam I91 represents the delivery of ten gallons, there will be ten gallons delivered at the slow rate of delivery.

However, the notches may be so spaced that it will require from one to nine transfers to bring notch 203 into operation after notch 205 has been positioned. This means that if one revolution of cam I91 represents ten gallons, any amount from 10 to 90 gallons may be delivered at the slow rate, depending upon the formation of cam 20I.

Cams 201 and" 209 are also mounted for loose rotation upon the shaft 59 and are provided with notches 2I3 and 2I5, respectively, and with numeral wheels. 1

The ball 2I1 is mounted for rotation about the shaft 2I9 and is provided with headed pin 22I. A lever 223 is pivoted on a pin 225 which passes through an axially elongated slot 221 in the lever so as to permit axial and rotative. movement of the lever. At the end of the lever opposite the slotted end, a projection 229 is provided which is adapted to follow on the cam I91.

' A recess 23I is formed below the projection and the edge of the lever forming the outline of the recess is adapted to engage in the recess formed by the bail 2I1 and the headed pin 22I. A spring 233 connects the lever 223 with shaft 2I9 so as to bias the lever and its projection 229 toward a position in engagement with cam I91.

Contact between pin HI and the edge of the lever transmits the pressure of the spring to the bail and urges it to rotate in a clockwise direction about shaft 2| 9 into a-position in engagement with the cams. A second bail 235 is mounted for rotation on shaft 2I9 and lies within the sides of the bail 2I1. The bail 235 is provided with follower projections similar to and underlying those on bail 2I1 and are adapted to engage the notches in the cams 20I, 201-and 209 as they come into alignment with them.

A lever 231 is fixed to said bail 235 and carries a bent-over ear 239 which lies under the control bar 24I. An adjustable stop 243 is threadably engaged with said ear and serves as a tappet which is adapted to engage the control bar. A spring 295 engages the arm 231 and a shaft 291 and biases said am toward the position in which the tappet will engage bar 2.

Notches 249 and 25I of successively greater depths are formed in the lower side of said control bar 2 and are adapted to successively engage the flange 253 on the stop plate 255 which is fixed to the stationary frame member.

A yoke 251 is mounted for vertical motion in said member 255 and embraces the control bar 24I. A depending stem onl said yoke passes through said member 255 and is positioned to be contacted by a stop 259 which is threaded through an opening in a bent-over ear 25I of lever 223. The emergency release mechanism disclosed in Figure 4 may be used in conjunction with the stop mechanism just described.

Operation Upon depression of the valve lever 2I,- the control bar I will be moved to the right in Figure 6 until the notch'25l engages the stop flange 253. vThereafter, the weight of the bail will maintain the parts in engaged position and when pressure on the lever 2I is released, the valve spring will force one edge of the notch in engagement when one side of the flange 253. This operation is performed, of course, after the desired setting has been made on the cams I91, MI, 201 and 209 as indicated by the associated indicator dials.

Upon opening of the valve the shaft I85 will be rotated by the meter to transmit motion through gears I89, I9I, I93 and I95 to the cam I91 and dial I99.

The described intermittent transfer mechanism transmits motion from cam I91 to adjacent cam 2M and similar transfer mechanisms transmit motion between adjacent pairs of cams MI, 201 and 209. As the desired quantity is discharged, cams 209, 201 and a notch 205 of cam 20I approach alignment with the followers on the bails 2H and 235, while the indicator dials approach zero indicating positions.

Upon alignment of said notches, a clockwise rotation of a bail 2I1 is effected by spring 233 and a similar rotation of bail 235 is effected by spring 245. This motion of bail 2I1 permits engagement of the projecting element 229 of lever 223 with cam I91 and as the notch in this cam comes into alignment with projection 229, the lever 223 is given a counter-clockwise rotation (Figure 6) by cam I91. This motion is transmitted to yoke 251 which in turn gives the bar 24I a clockwise rotation about pivot 29 (Figure 1) and this disengages notch 25I and stop flange 253 to permit a leftward motion of bar 2 under the action of the valve spring which motion will bring a shoulder of notch 249 into contact with the stop flange 253 and the bar 24I will be arrested before it reaches its home position so that the valve will be maintained partially opened. The dwell portion 263 of cam'20I intermediate notches 203 and 205 will permit continued engagement of cam I91 and follower 229 but since the axial motion of the follower toward the cam I91 is limited by the bail 2I1 by reason of the engagement of lever 223 with pin 22I on the bail, the amplitude of the actuation imparted to the follower by cam I91 is limited to that which is only sumcient to move notch 25I out of engagement with flange 253. Consequently, further actuations of the follower by the cam, being of the same amplitude, do not.

affect or operate the bar 24I.

However, one or more additional transfers of motion from cam I91 to the cam 20I depending upon the angular distance between notches 203 and 205 will bring notch 203, which is deeper than notch 205, into alignment with the followers on the bails and consequently a deeper engagement of the projection 229 with cam I91.

In the structure shown-in Figure 6, three transfers are required, after notch 205 has been occupied by the followers, to bring notch 203 into operative position. Thus, thirty gallons will be delivered at the slow rate of delivery. The amplitude of operation of the follower is substantially increased and this is sufficient to effect a second operation of the yoke 251 so as to release the notch 249 in control bar 24I from the stop flange 253. Such release will permit a full return of said stop bar to its home position under the action of the valve spring and will permit complete closure of the valve.

The brake mechanism shown in Figure 2 is used with this modification of the device and it is to be noted that the brake becomes effective at the time of the motion of bar 24I from its fully open to its intermediate position. This fact is believed self-evident from a comparison of Figures 2 and 6. From Figure 2 it is plain that the brake is not rendered ineffective until the latter portion of the valve opening stroke of bar 39, whereas in Figure 6 it is seen that the bar 24I moves a very substantial distance when it moves from its fast flow to its slow flow position.

In the event that the setting of the predetermining dials on cams is such that an amount less than the amount of liquid delivered at a slow rate is to be dispensed, it is desirable that the delivery be made at the slow rate of flow which obtains when the notch 249 is seated against the stop flange 253.

To accomplish this, it is necessary to prevent the notch 25I from engaging the stop flange 253 when the valve is open. The desired result is accomplished by the bail 235 and its associated arm 231. If the amount to be dispensed is within the range set forth, either notch 203 or 205 of cam 20I or the dwell portion 263 between them will be in alignment with the followers on bails 2H and 235.

This permits the bail 235 to assume either its intermediate or its farthest clockwise position under the action of spring 245 with the result that the lever 231 with the tappet 243 is elevated and engages the bar 24I. The adjustment of tappet 243 is such that bar I will be raised high enough to prevent engagement of the notch 25I and flange 253 as the valve I5 is opened by depressing the lever 2I.

Consequently when the lever 2| is depressed the valve will be completely open but as soon as pressure on the lever is released, the control bar 2 will return with the lever to a position with a shoulder of notch 249 in contact with the stop flange 253. Thus, it will be seen that delivery of liquid will take place at the slower rate and will be entirely stopped when the final actuation of the follower 229 occurs.

It is obvious that changes may be made in the form, construction and arrangement of parts without departing from the spirit of the invention and for this reason applicants do not desire to be limited to the specific forms of device which are disclosed for purposes of illustration but desire protection within the scope of the appended claims.

What we claim to be new and desire to protect by Letters Patent of the United States is:

1. In a predetermining stop mechanism, a control element displaceable from a home position to start a cycle of operation, latching means for retaining said element in displaced position, control mechanism for releasing said latching means after a cycle of operation of predetermined length, gearing for driving said control mechanism, brake means associated with said gearing to resist rotation thereof, and means, controlled by said element, for operating said brake means.

2. In a predetermined stop mechanism, a control element displaceable from a home position to start a cycle of operation, latching means for retaining said element in displaced position, control mechanism for releasing said latching means after a cycle of operation of predetermined length, gearing for driving said control mechanism, brake means associated with said gearing to resist rotation thereof, and means, operated by the control element upon displacement thereof, for releasing said brake means.

3. In a predetermined stop mechanism, a control element displaceable from a home position to start a cycle of operation, latching means for retaining said element in displaced position, cona cycle 01" operation of predetermined length,

I gearing for driving said control means, brake means for said gearing comprising a member rotatable with said gearing, a friction member movable to engage said rotatable member, and means on said control element for withdrawing said triction member from engagement with said rotatable member when said element is displaced from home position.

4. Ina multiple stage predetermining mechanism, a control element, mounting means for supporting said element for displacement in one direction from a normal position to start a cycle of operation, primary and secondary latching means for retaining said element in one or another of a plurality of displaced positions, said mounting means being adapted to support said element for movement to release said latching means, said secondary latching means being arranged to be engaged as said primarymeans are released upon one movement of said element and to be released upon another movement, a power driven element, a member mounted for travel into engagement with said power driven element for movement thereby, a power operated control mechanism associated with said member and adaptedto regulate the engaging travel thereof,

said power driven element and said member being'formed and arranged to impart to said member, successive movements having amplitudes proportional to the degree-of engagement, and means for transmitting the movements of said member to said control element. a

5. In a'mult'iple stagepredetermining mechanisin, a control element, means mounting said element for displacement from normal position to start a cycle of operation, primary releasable means for latching said element in one displaced position, secondary releasable means, operable after release of said primary means, for latching said elementin a second displaced position, means for releasing said latching means comprising a power driven element, a member mounted for travel into engagement with said power driven.

ineans on said power driven element for element,

jjimparting successive movements to said member and means operable by said member on each movement thereof for successively releasing said primary and secondary latching means.

6. In a multiple stage predetermining mecha nism, a control element, mounting means supporting said element for full or partial displacement from a normal position to start a, cycle of operation, latching means for retaining said element in fully displaced position, a power driven' element, a member mounted for travel into engagement with said power driven element, means on said power driven element for moving said member upon engagement thereof with said main-- ber, means operated by movement of said member for releasing said latching means, additional latching means rendered operative, after said release,'ior retaining said element in partially displaced position, said additional latching means being released upon a subsequent movement of said member.

I. In a multiple stage predetermining mechanism, a control element, mounting means supporting said element for displacement in one diment in another direction to disengage said abutments and stop, disengaging means comprising a power driven disk, a member mounted for travel into engagement with said disk and connected to actuate said element in a disengaging direction, means on said disk adapted to move said member through a distance proportional to the degree of engagement of said disk and element, means for controlling the degree of such engagement to provide successive actuations of said element of magnitudes suflicient to release said abutments in the order of their respective heights.

B. In a multiple stage predetermining mechanism, a control element, means mounting said element for displacement from normal position to start a cycle of operation, releasable primary means for latching said element in one displaced position, releasable secondary means, operable after release of said primary means, for latching said element in a second displaced position, means for releasing said latching means comprising a power driven element, a member mounted for travel into engagement with said power driven element, means on said power driven element for imparting successive movements to said member, a control mechanism associated with said member for preventing engagement oi said member and said power driven element until a predetermined phase in said cycle of operation is reached.

9. In a multiple stage predetermining mechanism, a control element, mounting means supporting said element for displacement from a normal position to start a cycle of operation, means for latching said element in any oi' a plurality oi displaced positions, said means comprising a stop and abutments or diflerent heights adapted to engage said stop, means mounting said stop and abutments for relative disengaging movement, disengaging means comprising a power driven disk, a member mounted for travel into engagement with said disk and connected to eflect relative disengaging movement of said stop and a abutments, means on said disk adapted to move said member through a distance proportional to the degree of engagement of said disk and element, means for controlling the degree oi? such engagement to provide, successive relative movements oi said stop and abutments of magnitudes sumeient to release, said abutments in the order element for applying said brake means upon returnoi. said element to home position.

, cmzmzm'r. GRIFFI'I'H.

LEE 3. HARTLEY. 

